Centrifugal liquid sprayer



Aug. 4, 1931. w. WEIMERS CENTR'IFUGAL LIQUID srnmrsn Filed March 21. 1929 Patented Aug. 4, 1931 UNITED STATES PATENT- OFFICE WILHELM WEIMERS, OF BERLIN, GERMANY, ASSIGNOR TO SIEMENS- SCHUCKERT- WERKE AKTIENGESELLSCHAFT, OF BER-LIN-SIEMENSSTADT, GER-MANY, A. CORPO- RATION OF GERMANY CENTRIFUGA L LIQUID SPRAYER Application filed March 21, 1929, Serial No.

My invention relates to improvements in centrifugal liquid sprayers, and more especially contemplates sprayers suitable for domestic dishwashers and rinsers which are capable of imparting a strong pressure to the liquid. Liquid sprayers of this character have usually been designed with a motor-driven substantially vertical shaft journaled at the bottom of a closed tub or container and provided with a centrifugal sprayer or projector wheel to which liquid is supplied by a pump which is'also mounted upon the driven shaft. More especially, my invention contemplates an improved construction for centrifugal liquid sprayers' in which a centrifugal wheel is mounted at the top of a rotary substantially vertical shaft and supplied with liquid through a tubular inlet by means of a pump mounted on said shaft.

The main object of my invention is to provide an improved construction for centrifugal liquid sprayers of this character.

More particularly stated, the object of my invention is to provide means of improved construction for regulating the discharge of liquid from a rotary wheel or spraying head. For this purpose, my improved construction contemplates suitable means such, for example, as slide or clack valves for the discharge outlets of the liquid sprayer from which the liquid is discharged at high velocity.

Preferably, I employ a centrifugal wheel with a perforated cylindrical wall upon which is slidably mounted a second cylindrical plate or shutter which may be provided with similarly arranged perforations movable more or less into and out of registry with the perforations in said cylindrical wall of the centrifugal wheel. By this means, the extent of opening of the discharge outlets may be adjusted at will to any required degree.

According to the preferred embodiment of my invention shown on the drawings, the

348,866, and in Germany March 28, 1928.

tubular member which conveys the liquid to the centrifugal sprayer wheel, is mounted on the rotary spindle which drives said wheel. This construction is advantageous for the reason that it causes the liquid to follow a straight axial path instead of a helical path as heretofore and thus-eliminates considerable friction losses during its passage to the centrifugal sprayer, thrower or projector wheel. It is then quite sulficient for the pump to consist of a simple wheel with oblique blades of comparatively smalil width to secure a suflicient supply of li ui In order that the Water flowing from the container into the pumpshould not be set in gyration and the raising action of the pump strongly reduced thereby, a plurality of baffle plates are preferably provided upon the bottom of the container. Three to four of such baffle plates suffice to prevent the gyration of the water.

The centrifugal spray wheel may be constructed in an effective manner by mounting a perforated shell on the perforated outer wall of the centrifugal wheel or drum and by making said outer shell adjustable for regulating the discharge of liquid which issues in many fine jets. In this form the centrifugal sprayer is particularly suitable for domestic dishwashers and rinsers. At the outlet openings, slides or disc's may be provided by means of which the width of the openings may be adjusted in any desired manner.

An embodiment of my'invention is illustrated in the drawings aflixed hereto and forming part of my specification.

In the drawings,

Fig. 1 is a sectional elevation of a dishwasher to which my improved sprayer has been applied, and

Fi 2, a sectional plan of the same.

Lilie parts are indicated by like numerals of reference in both figures of the drawings.

Referring to the drawings, 1 is the bot: tom of the tub or container of a dishwasher mounted on the framework 2. In the bottom of the container 1 is journaled a vertical shaft 3, which is rotated at a great speed by an electric motor 4 located underneath the machine and a belt drive 5. At the upper end of the shaft 3 is mounted a centrifugal spray wheel or drum, and connected thereto and rotatable with the driving shaft 3 is a tubular inlet 8. At or near the lower end of this tubular member thescrew pump is located. The liquid passes in the direction of the arrows through the tubularmemher 8. At the bottom of the container or tub there are provided a plurality of bafile plates 9, which prevent a gyratory movement of the liquid in the vicinity of the intake opening of the pump, which would otherwise reduce the quantity of liquid raised by the pump. The centrifugal spray wheel 6 is provided with a number of radial impeller blades 10 which spray and throw the raised liquid towards all sides at a high speed. The outlet openings of the centrifugal wheel are covered up by a sheet-iron cylinder 11 with numerous small perforations by means of which the liquid issuing is split up into a great number of fine jets. These jets of liquid are particularly suitable for washing dishes since they are ropelled and impinge with considerable f rce and are thus able to remove also dried particles of food from thesurfaces to be cleaned. To enable the thickness of the issuing jets of liquid to be regulated the perforated cylinder 11 may be surrounded by a second cylinder with perforations, which register with those in the first cylinder. By angularly displacing this cylinder 12 on the, cylinder 11 the quantity and force of the liquid thrown about by the spray wheel may be regulated in any manner desired. It will be understood, however, that instead of this second perforated cylinder 12 adjustable flaps hinged covers or the like may be pro vided for regulating the quantity of liquid sprayed on or between the dishes. Various modifications and changes may be made without departing from the spirit and the scope of the invention, and I desire, therefore, that only such limitations shall be placed thereon as are imposed by the prior art.

I claim as my invention:

1. A centrifugal liquid sprayer comprising a substantially vertical motor-driven shaft, 3. c lindrical sprayer head mounted at the top of said shaft, said cylindrical sprayer head being provided with discharge outlets in its peripheral wall, an imperforate tubular inlet depending from the bottom wall of said cylindrical sprayer head and around said motor-driven shaft, said tubular inlet being I adapted to convey liquid to said centrifugal sprayer head, means arranged within said sprayer head for propelling the liquid outwardly through said peripheral discharge outlets, and a shutter movably mounted on said sprayer head and provided with perforations movable in lesser or greater degree into registry with said discharge outlets in the peripheral wall of the sprayer head.

2. A centrifugal liquid sprayer comprising a rotary upright shaft, said shaft being provided with radial vanes, a housing mounted on said shaft and enclosing said radial vanes, said housing being provided with peripheral discharge outlets, means for conveying liquid to said housing, and a shutter for the peripheral wall of said housing for more or less closing said discharge outlets.

3. A centrifugal liquid sprayer comprising a rotary upright shaft, said shaft being provided with radial vanes, a housing mounted on said shaft and enclosing said radial vanes, said housing being provided with peripheral discharge outlets, means for conveying liquid to said housing, and means for variably controlling the discharge of liquid from said discharge outlets, said variable control means comprising a shutter adjustably mounted on the peripheral wall of said housing for uncoverin said discharge outlets in greater or lesser egree.

4. In a centrifugal 1i uid sprayer for dishwashers, rinsers, and t e like, the combination of a rotary shaft mounted on a substantially vertical axis, radial vanes mounted on the upper end of said rotary shaft, a cylindrical housing for said radial vanes, said cylindrical housing being provided with peripheral discharge outlets, and a cylindrical shutter slidable along the peripheral wall of said housing, said shutter being provided with perforations movable more or less into and out of registry with the discharge outlets in said cylindrical housing.

5. A centrifugal liquid sprayer for dishwashing and rinsing machines or the like, said centrifugal liquid sprayer comprising a motor-driven shaft adapted to be mounted on a substantially vertical axis in the bottom wall of a closed housing, a centrifugal sprayer wheel at the upper end of said shaft, means for conveying liquid to the liquidspraying wheel, and means for controlling the discharge of liquid from said sprayer wheel, said controlling means including a closed housing provided with adjustable openings.

6. A centrifugal liquid sprayer comprising in combination, a substantially vertical motor driven shaft, a centrifugal spray wheel mounted at the top of said shaft, said spray wheel having an outer wall provided with perforations, a tube arranged substantially coaxial with said shaft and opening above into said centrifugal spray wheel, a force pump mounted on said driving shaft/below said tube for supplying fluid to the lower end of said tube, and a perforated shutter movablearound the outer wall of said spray wheel, said shutter being provided with perforations adapted to vary the eflective area of the perforations in said outer wall of the spray wheel.

In testimony whereof I aflix my signam ture.

WILHELM WEIMERS'. 

